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- 주제어 : Nanoporous Alumina (검색결과 32 건)
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CdTe/GaAs Nanodot Arrays and Carbon Nanotubes Prepared Utilizing Nanoporous Alumina Templates
Sun-il Mho,WENSUN,정미,In-Hyeong Yeo 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.5
Nanoporous alumina templates were prepared by anodizing grain-free aluminum at constant voltage. The self-assembled hexagonally close-packed alumina cell result in ordered cylindrical nanohole arrays with interpore spacings ranging from 50 to 150 nm and pore sizes from 25 to 120 nm. Long-range-ordered CdTe nanodot arrays with controlled size and density were grown on GaAs substrates by using molecular-beam epitaxy with ultrathin nanoporous alumina masks; uniform dot sizes in the ranges of 35 nm (with a density of 2.5 10¹0 cm-²) and 80 nm (with a density of ~8.1 x 10 9 cm-²) were prepared as replicas of the alumina masks. The specic capacitances of the carbon nanotube (CNT) electrodes for electrochemical double-layer capacitors were significantly enhanced, a maximum value of 175 F g-¹, by using the nanoporous alumina/aluminum templates with high pore density and uniform pore diameter.
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Immobilization of biomaterials on nanopatterned surface using nanoporous alumina for biodevices
Mi Jung,Sang-Uk Kim,오병근,최정우 한국물리학회 2009 Current Applied Physics Vol.9 No.2
Nanobiodevices have been required to improve their performance based on their small size. Nanopatterning itself is a very important process in the fabrication of nanobiodevices. Furthermore, there are many challenges in immobilization of biomaterials on a nanopatterned surface, since the performance of biodevices is highly affected by the state of immobilized biomaterials on the substrate. In this paper, we introduce a simple and versatile approach for nanopatterning biomaterials using nanoporous alumina. Uniform nanoconcave patterns were revealed on the surface of aluminum after the removal of nanoporous alumina formed during anodization. Au was deposited on the nanopatterned surface by sputtering. Cysteine-modified azurin was then immobilized on the Au nanopatterned surface by self-assembled layer formation without any organic linker materials. The samples were investigated by phase contrast imaging in tapping mode of atomic force microscopy. These methods can be used for nanopatterning various biomaterials for their application to biochip and other bioelectronic devices. Nanobiodevices have been required to improve their performance based on their small size. Nanopatterning itself is a very important process in the fabrication of nanobiodevices. Furthermore, there are many challenges in immobilization of biomaterials on a nanopatterned surface, since the performance of biodevices is highly affected by the state of immobilized biomaterials on the substrate. In this paper, we introduce a simple and versatile approach for nanopatterning biomaterials using nanoporous alumina. Uniform nanoconcave patterns were revealed on the surface of aluminum after the removal of nanoporous alumina formed during anodization. Au was deposited on the nanopatterned surface by sputtering. Cysteine-modified azurin was then immobilized on the Au nanopatterned surface by self-assembled layer formation without any organic linker materials. The samples were investigated by phase contrast imaging in tapping mode of atomic force microscopy. These methods can be used for nanopatterning various biomaterials for their application to biochip and other bioelectronic devices.
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Immobilization of biomaterials on nanopatterned surface using nanoporous alumina for biodevices
Jung, M.,Kim, S.U.,Oh, B.K.,Choi, J.W. Elsevier 2009 CURRENT APPLIED PHYSICS Vol.9 No.2
Nanobiodevices have been required to improve their performance based on their small size. Nanopatterning itself is a very important process in the fabrication of nanobiodevices. Furthermore, there are many challenges in immobilization of biomaterials on a nanopatterned surface, since the performance of biodevices is highly affected by the state of immobilized biomaterials on the substrate. In this paper, we introduce a simple and versatile approach for nanopatterning biomaterials using nanoporous alumina. Uniform nanoconcave patterns were revealed on the surface of aluminum after the removal of nanoporous alumina formed during anodization. Au was deposited on the nanopatterned surface by sputtering. Cysteine-modified azurin was then immobilized on the Au nanopatterned surface by self-assembled layer formation without any organic linker materials. The samples were investigated by phase contrast imaging in tapping mode of atomic force microscopy. These methods can be used for nanopatterning various biomaterials for their application to biochip and other bioelectronic devices.
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Chemical, optical and transport characterization of ALD modified nanoporous alumina based structures
A.L. Cuevas,Ma. Valle Martínez de Yuso,L. Gelde,A.S. González,V. Vega,V.M. Prida,J. Benavente 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.91 No.-
Nanoporous alumina-based structures (NPA-bSs) obtained by anodization of aluminum in sulfuric acidmedium were coated by atomic layer deposition (ALD) of a thin conformal layer of different functionaloxides (Al2O3, TiO2, Fe2O3 or ZnO), leading to samples with similar geometrical parameters but differentsurface materials. Morphological characterization of the NPA-bSs confirms a reduction of about 35% inpore size associated to the presence of the oxides of interest, while chemical surface analysis permits theestimation of cover layer purity and thickness. Additionally, ALD functionalization also modifies optical(band-gap, refractive index and dielectric constant) according to transmittance and spectroscopicellipsometry results for visible and near-infrared regions, as well as electrolyte diffusive transportparameters (effectivefixed charge, ion transport numbers or ionic permselectivity) of the NPA-bSs, bothof which are dependent on the nature of the coating layer. Therefore, the suitability of ALD technique forgeometrical and functional modification of nanoporous structures is demonstrated, thus broadening thepotential application of these NPA-bSs platforms to optical sensing, nanophotonics, biosensing,microfluidics or drug delivery applications.
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박성,Hong Sick Kim,이재춘,Jin Young Park,Ju-Hyeon Lee 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.54 No.3
Nanoporous alumina substrates were prepared by anodization and the average pore size was about 150 nm. The surface area of the anodized alumina was increased by 6 times, depending on the anodization condition. Photocatalytic ZnO nanopowders were synthesized by using the solution combustion method (SCM), which was invented by present authors. Those nanopowders were coated on alumina substrates for immobilization. Ag ions were recovered from wastewater by using a photocatalytic reaction in order to evaluate the photocatalytic effect. To compare the Ag ion recovery rate, we carried out three sets of experiments: one using commercial ZnO powders, one using SCM ZnO powders immobilized on normal alumina substrates and one using SCM ZnO powders immobilized on nanoporous alumina substrates. The photocatalytic efficiency of the SCM ZnO powders immobilized on nanoporous alumina substrates was 2.5 times higher than that of the SCM ZnO powders immobilized on normal alumina substrates while the commercial ZnO powders did not show any photocatalytic reaction.
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하윤철,정대영 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.57 No.61
A series of processes for the fast fabrication of nanoporous anodic alumina membranes with highaspect-ratio, self-ordered pore arrays was developed based on a high-field 2-step anodization in a 0.3 M oxalic electrolyte. The dielectric breakdown commonly driven by the high electric field was circumvented by using a linear sweep of the initial voltage from 0 to 140 V, followed by a constant voltage of 140 V for the first step and by using a controlled growth rate that was adjusted by varying the electrolyte concentration while applying an instantaneous constant voltage of 140 V for the second step. A thick nanoporous film of about 120 um was grown within 2 hours with an average interpore distance of 310 nm and an average pore size of 50 nm, where the aspect ratio of the pores was over 2000. In order to overcome the problems associated with a thick barrier layer formed during the high-field anodization, we applied a pulsed electrochemical detachment technique to remove the base Al metal. A through-hole membrane with a pore size of about 210 nm was fabricated after widening the pores through a chemical etching of the pore walls. These novel processes ensure reliable fabrication of a high-field nanoporous anodic alumina membrane and provide a new template for nano-scale research.
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Yeom, Changju,Selvaraj, Rengaraj,Kim, Younghun THE KOREAN SOCIETY OF INDUSTRIAL AND ENGINEERING 2018 JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY -S Vol.67 No.-
<P><B>Abstract</B></P> <P>A cost-effective preparation method is proposed to prepare nanoporous alumina (NA) using aluminum chloride as a precursor with a lower cost than aluminum butoxide. In addition, the surfactant template was replaced with magnesium stearate, which has a lower unit cost in stearate acid. The adsorption isotherm test for the CO gas was carried out to compare the adsorption performance of the NA adsorbents prepared using post-hydrolysis (NA) and cost-effective precipitation (C-NA). In addition, C-NA exhibited a similar uptake capacity as NA, and the maximum uptake capacity of Pd/C-NA increased 1.3 times via Pd nanodots loading.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Nanoporous alumina (NA) was prepared by cost-effective (C) method. </LI> <LI> C-NA showed uniform pore size, interlinked pore system, and large surface area. </LI> <LI> C-NA exhibited 6–7 times higher uptake for CO than commercial adsorbents. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Platinum-Coated, Nanoporous Gold Nanorod Arrays: Synthesis and Characterization
Yoo, S.-H.,Park, S. WILEY-VCH Verlag 2007 Advanced Materials Vol.19 No.12
<B>Graphic Abstract</B> <P>The fabrication of Pt-coated, vertically aligned, nanoporous gold-nanorod arrays (see figure, left panel) that display electrocatalytically active large surface areas is described. Epitaxial platinum coatings only 1–2 monolayers thick are prepared by the spontaneous replacement of an electrochemically deposited copper layer with platinum metal. Electrochemical characterization of the resulting nanoporous nanorod arrays (see figure, right panel) is carried out as a method for probing catalytic behavior. <img src='wiley_img/09359648-2007-19-12-ADMA200602551-content.gif' alt='wiley_img/09359648-2007-19-12-ADMA200602551-content'> </P>
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Chae, Weon-Sik,Im, Sung-Jae,Lee, Jin-Kyu,Kim, Yong-Rok Korean Chemical Society 2005 Bulletin of the Korean Chemical Society Vol.26 No.3
Free-standing nanoporous alumina membrane microtubes with different shapes (rectangular and cylindrical tubes) and variable dimensions were easily fabricated by direct anodization of the aluminum templates of the specified shapes (strip and wire) and dimensions during the electrochemical reaction.
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김용록,Sung-Jae Im,이진규,Weon-Sik Chae 대한화학회 2005 Bulletin of the Korean Chemical Society Vol.26 No.3
Free-standing nanoporous alumina membrane microtubes with different shapes (rectangular and cylindrical tubes) and variable dimensions were easily fabricated by direct anodization of the aluminum templates of the specified shapes (strip and wire) and dimensions during the electrochemical reaction.
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